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<h1><a class="toc-backref" href="./changes-in-boost-1-32-0.html#id66" name="tag-dispatching-protocol">Tag Dispatching Protocol</a></h1>
<p>The mechanism used to select algorithm implementations based on
sequence family has been changed to use metafunction classes:</p>
<table border="1" class="table">
<colgroup>
<col width="53%" />
<col width="47%" />
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<tr><th>Before</th>
<th>Now</th>
</tr>
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<tr><td><em>name</em><tt class="literal"><span class="pre">_traits&lt;Tag&gt;::algorithm&lt;...&gt;::type</span></tt></td>
<td><em>name</em><tt class="literal"><span class="pre">_impl&lt;Tag&gt;::apply&lt;...&gt;::type</span></tt></td>
</tr>
</tbody>
</table>
<p>If your code implemented a custom sequence, it needs to be adjusted
according to the above table; for example:</p>
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<tr><td><pre class="first last literal-block">
template&lt;&gt; struct begin_traits&lt;my_tag&gt;
{
    template&lt; typename S &gt; struct algorithm
    {
        typedef ... type;
    };
};
</pre>
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template&lt;&gt; struct begin_<strong>impl</strong>&lt;my_tag&gt;
{
    template&lt; typename S &gt; struct <strong>apply</strong>
    {
        typedef ... type;
    };
};
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